Not many people can commit such a heinous crime ‘in cold blood’. What does the quoted idiom mean?  14th BCS- বিসিএস

(ক) In cool brain and calculeted thought
(খ) So patiently and thoughtfully
(গ) So impatiently and thoughtlessly
(ঘ) Stirred by sudden emotion

উত্তরমালাঃ (ক) In cool brain and calculeted thought